Isroil A. Instructional Materials of Quadratic Equations for 10th Grade Indonesia Students: Combined Round Robin-Cooperative Learning and Problem Posing . karangan [Internet]. 2020 Feb. 18 [cited 2025 Mar. 2];2(01):1-6. Available from: https://ejournal.billfath.ac.id/index.php/karangan/article/view/39